pv/view/view.cpp

   1 /*
   2  * This file is part of the PulseView project.
   3  *
   4  * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  19  */
  20
  21 #ifdef ENABLE_DECODE
  22 #include <libsigrokdecode/libsigrokdecode.h>
  23 #endif
  24
  25 #include <extdef.h>
  26
  27 #include <algorithm>
  28 #include <cassert>
  29 #include <climits>
  30 #include <cmath>
  31 #include <iterator>
  32 #include <mutex>
  33 #include <unordered_set>
  34
  35 #include <boost/thread/locks.hpp>
  36
  37 #include <QApplication>
  38 #include <QEvent>
  39 #include <QFontMetrics>
  40 #include <QMouseEvent>
  41 #include <QScrollBar>
  42
  43 #include <libsigrokcxx/libsigrokcxx.hpp>
  44
  45 #include "decodetrace.hpp"
  46 #include "header.hpp"
  47 #include "logicsignal.hpp"
  48 #include "ruler.hpp"
  49 #include "signal.hpp"
  50 #include "tracegroup.hpp"
  51 #include "triggermarker.hpp"
  52 #include "view.hpp"
  53 #include "viewport.hpp"
  54
  55 #include "pv/session.hpp"
  56 #include "pv/devices/device.hpp"
  57 #include "pv/data/logic.hpp"
  58 #include "pv/data/logicsegment.hpp"
  59 #include "pv/util.hpp"
  60
  61 using boost::shared_lock;
  62 using boost::shared_mutex;
  63
  64 using pv::data::SignalData;
  65 using pv::data::Segment;
  66 using pv::util::TimeUnit;
  67 using pv::util::Timestamp;
  68
  69 using std::back_inserter;
  70 using std::copy_if;
  71 using std::deque;
  72 using std::dynamic_pointer_cast;
  73 using std::inserter;
  74 using std::list;
  75 using std::lock_guard;
  76 using std::max;
  77 using std::make_pair;
  78 using std::make_shared;
  79 using std::min;
  80 using std::pair;
  81 using std::set;
  82 using std::set_difference;
  83 using std::shared_ptr;
  84 using std::unordered_map;
  85 using std::unordered_set;
  86 using std::vector;
  87 using std::weak_ptr;
  88
  89 namespace pv {
  90 namespace view {
  91
  92 const Timestamp View::MaxScale("1e9");
  93 const Timestamp View::MinScale("1e-12");
  94
  95 const int View::MaxScrollValue = INT_MAX / 2;
  96 const int View::MaxViewAutoUpdateRate = 25; // No more than 25 Hz with sticky scrolling
  97
  98 const int View::ScaleUnits[3] = {1, 2, 5};
  99
 100 View::View(Session &session, QWidget *parent) :
 101         QAbstractScrollArea(parent),
 102         session_(session),
 103         viewport_(new Viewport(*this)),
 104         ruler_(new Ruler(*this)),
 105         header_(new Header(*this)),
 106         scale_(1e-3),
 107         offset_(0),
 108         updating_scroll_(false),
 109         sticky_scrolling_(false), // Default setting is set in MainWindow::setup_ui()
 110         always_zoom_to_fit_(false),
 111         tick_period_(0),
 112         tick_prefix_(pv::util::SIPrefix::yocto),
 113         tick_precision_(0),
 114         time_unit_(util::TimeUnit::Time),
 115         show_cursors_(false),
 116         cursors_(new CursorPair(*this)),
 117         next_flag_text_('A'),
 118         trigger_marker_(nullptr),
 119         hover_point_(-1, -1)
 120 {
 121         connect(horizontalScrollBar(), SIGNAL(valueChanged(int)),
 122                 this, SLOT(h_scroll_value_changed(int)));
 123         connect(verticalScrollBar(), SIGNAL(valueChanged(int)),
 124                 this, SLOT(v_scroll_value_changed()));
 125
 126         connect(&session_, SIGNAL(signals_changed()),
 127                 this, SLOT(signals_changed()));
 128         connect(&session_, SIGNAL(capture_state_changed(int)),
 129                 this, SLOT(capture_state_updated(int)));
 130         connect(&session_, SIGNAL(data_received()),
 131                 this, SLOT(data_updated()));
 132         connect(&session_, SIGNAL(frame_ended()),
 133                 this, SLOT(data_updated()));
 134
 135         connect(header_, SIGNAL(selection_changed()),
 136                 ruler_, SLOT(clear_selection()));
 137         connect(ruler_, SIGNAL(selection_changed()),
 138                 header_, SLOT(clear_selection()));
 139
 140         connect(header_, SIGNAL(selection_changed()),
 141                 this, SIGNAL(selection_changed()));
 142         connect(ruler_, SIGNAL(selection_changed()),
 143                 this, SIGNAL(selection_changed()));
 144
 145         connect(this, SIGNAL(hover_point_changed()),
 146                 this, SLOT(on_hover_point_changed()));
 147
 148         connect(&lazy_event_handler_, SIGNAL(timeout()),
 149                 this, SLOT(process_sticky_events()));
 150         lazy_event_handler_.setSingleShot(true);
 151
 152         connect(&delayed_view_updater_, SIGNAL(timeout()),
 153                 this, SLOT(perform_delayed_view_update()));
 154         delayed_view_updater_.setSingleShot(true);
 155         delayed_view_updater_.setInterval(1000 / MaxViewAutoUpdateRate);
 156
 157         setViewport(viewport_);
 158
 159         viewport_->installEventFilter(this);
 160         ruler_->installEventFilter(this);
 161         header_->installEventFilter(this);
 162
 163         // Trigger the initial event manually. The default device has signals
 164         // which were created before this object came into being
 165         signals_changed();
 166
 167         // make sure the transparent widgets are on the top
 168         ruler_->raise();
 169         header_->raise();
 170
 171         // Update the zoom state
 172         calculate_tick_spacing();
 173 }
 174
 175 Session& View::session()
 176 {
 177         return session_;
 178 }
 179
 180 const Session& View::session() const
 181 {
 182         return session_;
 183 }
 184
 185 View* View::view()
 186 {
 187         return this;
 188 }
 189
 190 const View* View::view() const
 191 {
 192         return this;
 193 }
 194
 195 Viewport* View::viewport()
 196 {
 197         return viewport_;
 198 }
 199
 200 const Viewport* View::viewport() const
 201 {
 202         return viewport_;
 203 }
 204
 205 vector< shared_ptr<TimeItem> > View::time_items() const
 206 {
 207         const vector<shared_ptr<Flag>> f(flags());
 208         vector<shared_ptr<TimeItem>> items(f.begin(), f.end());
 209         items.push_back(cursors_);
 210         items.push_back(cursors_->first());
 211         items.push_back(cursors_->second());
 212
 213         if (trigger_marker_)
 214                 items.push_back(trigger_marker_);
 215
 216         return items;
 217 }
 218
 219 double View::scale() const
 220 {
 221         return scale_;
 222 }
 223
 224 void View::set_scale(double scale)
 225 {
 226         if (scale_ != scale) {
 227                 scale_ = scale;
 228                 Q_EMIT scale_changed();
 229         }
 230 }
 231
 232 const Timestamp& View::offset() const
 233 {
 234         return offset_;
 235 }
 236
 237 void View::set_offset(const pv::util::Timestamp& offset)
 238 {
 239         if (offset_ != offset) {
 240                 offset_ = offset;
 241                 Q_EMIT offset_changed();
 242         }
 243 }
 244
 245 int View::owner_visual_v_offset() const
 246 {
 247         return -verticalScrollBar()->sliderPosition();
 248 }
 249
 250 void View::set_v_offset(int offset)
 251 {
 252         verticalScrollBar()->setSliderPosition(offset);
 253         header_->update();
 254         viewport_->update();
 255 }
 256
 257 unsigned int View::depth() const
 258 {
 259         return 0;
 260 }
 261
 262 pv::util::SIPrefix View::tick_prefix() const
 263 {
 264         return tick_prefix_;
 265 }
 266
 267 void View::set_tick_prefix(pv::util::SIPrefix tick_prefix)
 268 {
 269         if (tick_prefix_ != tick_prefix) {
 270                 tick_prefix_ = tick_prefix;
 271                 Q_EMIT tick_prefix_changed();
 272         }
 273 }
 274
 275 unsigned int View::tick_precision() const
 276 {
 277         return tick_precision_;
 278 }
 279
 280 void View::set_tick_precision(unsigned tick_precision)
 281 {
 282         if (tick_precision_ != tick_precision) {
 283                 tick_precision_ = tick_precision;
 284                 Q_EMIT tick_precision_changed();
 285         }
 286 }
 287
 288 const pv::util::Timestamp& View::tick_period() const
 289 {
 290         return tick_period_;
 291 }
 292
 293 void View::set_tick_period(const pv::util::Timestamp& tick_period)
 294 {
 295         if (tick_period_ != tick_period) {
 296                 tick_period_ = tick_period;
 297                 Q_EMIT tick_period_changed();
 298         }
 299 }
 300
 301 TimeUnit View::time_unit() const
 302 {
 303         return time_unit_;
 304 }
 305
 306 void View::set_time_unit(pv::util::TimeUnit time_unit)
 307 {
 308         if (time_unit_ != time_unit) {
 309                 time_unit_ = time_unit;
 310                 Q_EMIT time_unit_changed();
 311         }
 312 }
 313
 314 void View::zoom(double steps)
 315 {
 316         zoom(steps, viewport_->width() / 2);
 317 }
 318
 319 void View::zoom(double steps, int offset)
 320 {
 321         set_zoom(scale_ * pow(3.0/2.0, -steps), offset);
 322 }
 323
 324 void View::zoom_fit(bool gui_state)
 325 {
 326         // Act as one-shot when stopped, toggle along with the GUI otherwise
 327         if (session_.get_capture_state() == Session::Stopped) {
 328                 always_zoom_to_fit_ = false;
 329                 always_zoom_to_fit_changed(false);
 330         } else {
 331                 always_zoom_to_fit_ = gui_state;
 332                 always_zoom_to_fit_changed(gui_state);
 333         }
 334
 335         const pair<Timestamp, Timestamp> extents = get_time_extents();
 336         const Timestamp delta = extents.second - extents.first;
 337         if (delta < Timestamp("1e-12"))
 338                 return;
 339
 340         assert(viewport_);
 341         const int w = viewport_->width();
 342         if (w <= 0)
 343                 return;
 344
 345         const Timestamp scale = max(min(delta / w, MaxScale), MinScale);
 346         set_scale_offset(scale.convert_to<double>(), extents.first);
 347 }
 348
 349 void View::zoom_one_to_one()
 350 {
 351         using pv::data::SignalData;
 352
 353         // Make a set of all the visible data objects
 354         set< shared_ptr<SignalData> > visible_data = get_visible_data();
 355         if (visible_data.empty())
 356                 return;
 357
 358         assert(viewport_);
 359         const int w = viewport_->width();
 360         if (w <= 0)
 361                 return;
 362
 363         set_zoom(1.0 / session_.get_samplerate(), w / 2);
 364 }
 365
 366 void View::set_scale_offset(double scale, const Timestamp& offset)
 367 {
 368         // Disable sticky scrolling / always zoom to fit when acquisition runs
 369         // and user drags the viewport
 370         if ((scale_ == scale) && (offset_ != offset) &&
 371                         (session_.get_capture_state() == Session::Running)) {
 372
 373                 if (sticky_scrolling_) {
 374                         sticky_scrolling_ = false;
 375                         sticky_scrolling_changed(false);
 376                 }
 377
 378                 if (always_zoom_to_fit_) {
 379                         always_zoom_to_fit_ = false;
 380                         always_zoom_to_fit_changed(false);
 381                 }
 382         }
 383
 384         set_scale(scale);
 385         set_offset(offset);
 386
 387         calculate_tick_spacing();
 388
 389         update_scroll();
 390         ruler_->update();
 391         viewport_->update();
 392 }
 393
 394 set< shared_ptr<SignalData> > View::get_visible_data() const
 395 {
 396         const unordered_set< shared_ptr<Signal> > sigs(session().signals());
 397
 398         // Make a set of all the visible data objects
 399         set< shared_ptr<SignalData> > visible_data;
 400         for (const shared_ptr<Signal> sig : sigs)
 401                 if (sig->enabled())
 402                         visible_data.insert(sig->data());
 403
 404         return visible_data;
 405 }
 406
 407 pair<Timestamp, Timestamp> View::get_time_extents() const
 408 {
 409         boost::optional<Timestamp> left_time, right_time;
 410         const set< shared_ptr<SignalData> > visible_data = get_visible_data();
 411         for (const shared_ptr<SignalData> d : visible_data)
 412         {
 413                 const vector< shared_ptr<Segment> > segments =
 414                         d->segments();
 415                 for (const shared_ptr<Segment> &s : segments) {
 416                         double samplerate = s->samplerate();
 417                         samplerate = (samplerate <= 0.0) ? 1.0 : samplerate;
 418
 419                         const Timestamp start_time = s->start_time();
 420                         left_time = left_time ?
 421                                 min(*left_time, start_time) :
 422                                                 start_time;
 423                         right_time = right_time ?
 424                                 max(*right_time, start_time + d->max_sample_count() / samplerate) :
 425                                                  start_time + d->max_sample_count() / samplerate;
 426                 }
 427         }
 428
 429         if (!left_time || !right_time)
 430                 return make_pair(0, 0);
 431
 432         assert(*left_time < *right_time);
 433         return make_pair(*left_time, *right_time);
 434 }
 435
 436 void View::enable_sticky_scrolling(bool state)
 437 {
 438         sticky_scrolling_ = state;
 439 }
 440
 441 bool View::cursors_shown() const
 442 {
 443         return show_cursors_;
 444 }
 445
 446 void View::show_cursors(bool show)
 447 {
 448         show_cursors_ = show;
 449         ruler_->update();
 450         viewport_->update();
 451 }
 452
 453 void View::centre_cursors()
 454 {
 455         const double time_width = scale_ * viewport_->width();
 456         cursors_->first()->set_time(offset_ + time_width * 0.4);
 457         cursors_->second()->set_time(offset_ + time_width * 0.6);
 458         ruler_->update();
 459         viewport_->update();
 460 }
 461
 462 std::shared_ptr<CursorPair> View::cursors() const
 463 {
 464         return cursors_;
 465 }
 466
 467 void View::add_flag(const Timestamp& time)
 468 {
 469         flags_.push_back(shared_ptr<Flag>(new Flag(*this, time,
 470                 QString("%1").arg(next_flag_text_))));
 471
 472         next_flag_text_ = (next_flag_text_ >= 'Z') ? 'A' :
 473                 (next_flag_text_ + 1);
 474
 475         time_item_appearance_changed(true, true);
 476 }
 477
 478 void View::remove_flag(std::shared_ptr<Flag> flag)
 479 {
 480         flags_.remove(flag);
 481         time_item_appearance_changed(true, true);
 482 }
 483
 484 vector< std::shared_ptr<Flag> > View::flags() const
 485 {
 486         vector< std::shared_ptr<Flag> > flags(flags_.begin(), flags_.end());
 487         stable_sort(flags.begin(), flags.end(),
 488                 [](const shared_ptr<Flag> &a, const shared_ptr<Flag> &b) {
 489                         return a->time() < b->time();
 490                 });
 491
 492         return flags;
 493 }
 494
 495 const QPoint& View::hover_point() const
 496 {
 497         return hover_point_;
 498 }
 499
 500 void View::update_viewport()
 501 {
 502         assert(viewport_);
 503         viewport_->update();
 504         header_->update();
 505 }
 506
 507 void View::restack_all_trace_tree_items()
 508 {
 509         // Make a list of owners that is sorted from deepest first
 510         const vector<shared_ptr<TraceTreeItem>> items(
 511                 list_by_type<TraceTreeItem>());
 512         set< TraceTreeItemOwner* > owners;
 513         for (const auto &r : items)
 514                 owners.insert(r->owner());
 515         vector< TraceTreeItemOwner* > sorted_owners(owners.begin(), owners.end());
 516         sort(sorted_owners.begin(), sorted_owners.end(),
 517                 [](const TraceTreeItemOwner* a, const TraceTreeItemOwner *b) {
 518                         return a->depth() > b->depth(); });
 519
 520         // Restack the items recursively
 521         for (auto &o : sorted_owners)
 522                 o->restack_items();
 523
 524         // Animate the items to their destination
 525         for (const auto &i : items)
 526                 i->animate_to_layout_v_offset();
 527 }
 528
 529 void View::trigger_event(util::Timestamp location)
 530 {
 531         if (trigger_marker_)
 532                 trigger_marker_->set_time(location);
 533         else
 534                 trigger_marker_ = std::shared_ptr<TriggerMarker>(new TriggerMarker(*this, location));
 535 }
 536
 537 void View::get_scroll_layout(double &length, Timestamp &offset) const
 538 {
 539         const pair<Timestamp, Timestamp> extents = get_time_extents();
 540         length = ((extents.second - extents.first) / scale_).convert_to<double>();
 541         offset = offset_ / scale_;
 542 }
 543
 544 void View::set_zoom(double scale, int offset)
 545 {
 546         // Reset the "always zoom to fit" feature as the user changed the zoom
 547         always_zoom_to_fit_ = false;
 548         always_zoom_to_fit_changed(false);
 549
 550         const Timestamp cursor_offset = offset_ + scale_ * offset;
 551         const Timestamp new_scale = max(min(Timestamp(scale), MaxScale), MinScale);
 552         const Timestamp new_offset = cursor_offset - new_scale * offset;
 553         set_scale_offset(new_scale.convert_to<double>(), new_offset);
 554 }
 555
 556 void View::calculate_tick_spacing()
 557 {
 558         const double SpacingIncrement = 10.0f;
 559         const double MinValueSpacing = 40.0f;
 560
 561         // Figure out the highest numeric value visible on a label
 562         const QSize areaSize = viewport_->size();
 563         const Timestamp max_time = max(fabs(offset_),
 564                 fabs(offset_ + scale_ * areaSize.width()));
 565
 566         double min_width = SpacingIncrement;
 567         double label_width, tick_period_width;
 568
 569         QFontMetrics m(QApplication::font());
 570
 571         // Copies of the member variables with the same name, used in the calculation
 572         // and written back afterwards, so that we don't emit signals all the time
 573         // during the calculation.
 574         pv::util::Timestamp tick_period = tick_period_;
 575         pv::util::SIPrefix tick_prefix = tick_prefix_;
 576         unsigned tick_precision = tick_precision_;
 577
 578         do {
 579                 const double min_period = scale_ * min_width;
 580
 581                 const int order = (int)floorf(log10f(min_period));
 582                 const pv::util::Timestamp order_decimal =
 583                         pow(pv::util::Timestamp(10), order);
 584
 585                 // Allow for a margin of error so that a scale unit of 1 can be used.
 586                 // Otherwise, for a SU of 1 the tick period will almost always be below
 587                 // the min_period by a small amount - and thus skipped in favor of 2.
 588                 // Note: margin assumes that SU[0] and SU[1] contain the smallest values
 589                 double tp_margin = (ScaleUnits[0] + ScaleUnits[1]) / 2.0;
 590                 double tp_with_margin;
 591                 unsigned int unit = 0;
 592
 593                 do {
 594                         tp_with_margin = order_decimal.convert_to<double>() *
 595                                 (ScaleUnits[unit++] + tp_margin);
 596                 } while (tp_with_margin < min_period && unit < countof(ScaleUnits));
 597
 598                 tick_period = order_decimal * ScaleUnits[unit - 1];
 599                 tick_prefix = static_cast<pv::util::SIPrefix>(
 600                         (order - pv::util::exponent(pv::util::SIPrefix::yocto)) / 3);
 601
 602                 // Precision is the number of fractional digits required, not
 603                 // taking the prefix into account (and it must never be negative)
 604                 tick_precision = std::max(ceil(log10(1 / tick_period)).convert_to<int>(), 0);
 605
 606                 tick_period_width = (tick_period / scale_).convert_to<double>();
 607
 608                 const QString label_text = Ruler::format_time_with_distance(
 609                         tick_period, max_time, tick_prefix, time_unit_, tick_precision);
 610
 611                 label_width = m.boundingRect(0, 0, INT_MAX, INT_MAX,
 612                         Qt::AlignLeft | Qt::AlignTop, label_text).width() +
 613                                 MinValueSpacing;
 614
 615                 min_width += SpacingIncrement;
 616         } while (tick_period_width < label_width);
 617
 618         set_tick_period(tick_period);
 619         set_tick_prefix(tick_prefix);
 620         set_tick_precision(tick_precision);
 621 }
 622
 623 void View::update_scroll()
 624 {
 625         assert(viewport_);
 626
 627         const QSize areaSize = viewport_->size();
 628
 629         // Set the horizontal scroll bar
 630         double length = 0;
 631         Timestamp offset;
 632         get_scroll_layout(length, offset);
 633         length = max(length - areaSize.width(), 0.0);
 634
 635         int major_tick_distance = (tick_period_ / scale_).convert_to<int>();
 636
 637         horizontalScrollBar()->setPageStep(areaSize.width() / 2);
 638         horizontalScrollBar()->setSingleStep(major_tick_distance);
 639
 640         updating_scroll_ = true;
 641
 642         if (length < MaxScrollValue) {
 643                 horizontalScrollBar()->setRange(0, length);
 644                 horizontalScrollBar()->setSliderPosition(offset.convert_to<double>());
 645         } else {
 646                 horizontalScrollBar()->setRange(0, MaxScrollValue);
 647                 horizontalScrollBar()->setSliderPosition(
 648                         (offset_ * MaxScrollValue / (scale_ * length)).convert_to<double>());
 649         }
 650
 651         updating_scroll_ = false;
 652
 653         // Set the vertical scrollbar
 654         verticalScrollBar()->setPageStep(areaSize.height());
 655         verticalScrollBar()->setSingleStep(areaSize.height() / 8);
 656
 657         const pair<int, int> extents = v_extents();
 658         verticalScrollBar()->setRange(extents.first - (areaSize.height() / 2),
 659                 extents.second - (areaSize.height() / 2));
 660 }
 661
 662 void View::update_layout()
 663 {
 664         setViewportMargins(
 665                 header_->sizeHint().width() - pv::view::Header::BaselineOffset,
 666                 ruler_->sizeHint().height(), 0, 0);
 667         ruler_->setGeometry(viewport_->x(), 0,
 668                 viewport_->width(), ruler_->extended_size_hint().height());
 669         header_->setGeometry(0, viewport_->y(),
 670                 header_->extended_size_hint().width(), viewport_->height());
 671         update_scroll();
 672 }
 673
 674 void View::paint_label(QPainter &p, const QRect &rect, bool hover)
 675 {
 676         (void)p;
 677         (void)rect;
 678         (void)hover;
 679 }
 680
 681 QRectF View::label_rect(const QRectF &rect)
 682 {
 683         (void)rect;
 684         return QRectF();
 685 }
 686
 687 TraceTreeItemOwner* View::find_prevalent_trace_group(
 688         const shared_ptr<sigrok::ChannelGroup> &group,
 689         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 690                 &signal_map)
 691 {
 692         assert(group);
 693
 694         unordered_set<TraceTreeItemOwner*> owners;
 695         vector<TraceTreeItemOwner*> owner_list;
 696
 697         // Make a set and a list of all the owners
 698         for (const auto &channel : group->channels()) {
 699                 const auto iter = signal_map.find(channel);
 700                 if (iter == signal_map.end())
 701                         continue;
 702
 703                 TraceTreeItemOwner *const o = (*iter).second->owner();
 704                 owner_list.push_back(o);
 705                 owners.insert(o);
 706         }
 707
 708         // Iterate through the list of owners, and find the most prevalent
 709         size_t max_prevalence = 0;
 710         TraceTreeItemOwner *prevalent_owner = nullptr;
 711         for (TraceTreeItemOwner *owner : owners) {
 712                 const size_t prevalence = std::count_if(
 713                         owner_list.begin(), owner_list.end(),
 714                         [&](TraceTreeItemOwner *o) { return o == owner; });
 715                 if (prevalence > max_prevalence) {
 716                         max_prevalence = prevalence;
 717                         prevalent_owner = owner;
 718                 }
 719         }
 720
 721         return prevalent_owner;
 722 }
 723
 724 vector< shared_ptr<Trace> > View::extract_new_traces_for_channels(
 725         const vector< shared_ptr<sigrok::Channel> > &channels,
 726         const unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 727                 &signal_map,
 728         set< shared_ptr<Trace> > &add_list)
 729 {
 730         vector< shared_ptr<Trace> > filtered_traces;
 731
 732         for (const auto &channel : channels)
 733         {
 734                 const auto map_iter = signal_map.find(channel);
 735                 if (map_iter == signal_map.end())
 736                         continue;
 737
 738                 shared_ptr<Trace> trace = (*map_iter).second;
 739                 const auto list_iter = add_list.find(trace);
 740                 if (list_iter == add_list.end())
 741                         continue;
 742
 743                 filtered_traces.push_back(trace);
 744                 add_list.erase(list_iter);
 745         }
 746
 747         return filtered_traces;
 748 }
 749
 750 void View::determine_time_unit()
 751 {
 752         // Check whether we know the sample rate and hence can use time as the unit
 753         if (time_unit_ == util::TimeUnit::Samples) {
 754                 const unordered_set< shared_ptr<Signal> > sigs(session().signals());
 755
 756                 // Check all signals but...
 757                 for (const shared_ptr<Signal> signal : sigs) {
 758                         const shared_ptr<SignalData> data = signal->data();
 759
 760                         // ...only check first segment of each
 761                         const vector< shared_ptr<Segment> > segments = data->segments();
 762                         if (!segments.empty())
 763                                 if (segments[0]->samplerate()) {
 764                                         set_time_unit(util::TimeUnit::Time);
 765                                         break;
 766                                 }
 767                 }
 768         }
 769 }
 770
 771 bool View::eventFilter(QObject *object, QEvent *event)
 772 {
 773         const QEvent::Type type = event->type();
 774         if (type == QEvent::MouseMove) {
 775
 776                 const QMouseEvent *const mouse_event = (QMouseEvent*)event;
 777                 if (object == viewport_)
 778                         hover_point_ = mouse_event->pos();
 779                 else if (object == ruler_)
 780                         hover_point_ = QPoint(mouse_event->x(), 0);
 781                 else if (object == header_)
 782                         hover_point_ = QPoint(0, mouse_event->y());
 783                 else
 784                         hover_point_ = QPoint(-1, -1);
 785
 786                 hover_point_changed();
 787
 788         } else if (type == QEvent::Leave) {
 789                 hover_point_ = QPoint(-1, -1);
 790                 hover_point_changed();
 791         }
 792
 793         return QObject::eventFilter(object, event);
 794 }
 795
 796 bool View::viewportEvent(QEvent *e)
 797 {
 798         switch(e->type()) {
 799         case QEvent::Paint:
 800         case QEvent::MouseButtonPress:
 801         case QEvent::MouseButtonRelease:
 802         case QEvent::MouseButtonDblClick:
 803         case QEvent::MouseMove:
 804         case QEvent::Wheel:
 805         case QEvent::TouchBegin:
 806         case QEvent::TouchUpdate:
 807         case QEvent::TouchEnd:
 808                 return false;
 809
 810         default:
 811                 return QAbstractScrollArea::viewportEvent(e);
 812         }
 813 }
 814
 815 void View::resizeEvent(QResizeEvent*)
 816 {
 817         update_layout();
 818 }
 819
 820 void View::row_item_appearance_changed(bool label, bool content)
 821 {
 822         if (label)
 823                 header_->update();
 824         if (content)
 825                 viewport_->update();
 826 }
 827
 828 void View::time_item_appearance_changed(bool label, bool content)
 829 {
 830         if (label)
 831                 ruler_->update();
 832         if (content)
 833                 viewport_->update();
 834 }
 835
 836 void View::extents_changed(bool horz, bool vert)
 837 {
 838         sticky_events_ |=
 839                 (horz ? TraceTreeItemHExtentsChanged : 0) |
 840                 (vert ? TraceTreeItemVExtentsChanged : 0);
 841         lazy_event_handler_.start();
 842 }
 843
 844 void View::h_scroll_value_changed(int value)
 845 {
 846         if (updating_scroll_)
 847                 return;
 848
 849         // Disable sticky scrolling when user moves the horizontal scroll bar
 850         // during a running acquisition
 851         if (sticky_scrolling_ && (session_.get_capture_state() == Session::Running)) {
 852                 sticky_scrolling_ = false;
 853                 sticky_scrolling_changed(false);
 854         }
 855
 856         const int range = horizontalScrollBar()->maximum();
 857         if (range < MaxScrollValue)
 858                 set_offset(scale_ * value);
 859         else {
 860                 double length = 0;
 861                 Timestamp offset;
 862                 get_scroll_layout(length, offset);
 863                 set_offset(scale_ * length * value / MaxScrollValue);
 864         }
 865
 866         ruler_->update();
 867         viewport_->update();
 868 }
 869
 870 void View::v_scroll_value_changed()
 871 {
 872         header_->update();
 873         viewport_->update();
 874 }
 875
 876 void View::signals_changed()
 877 {
 878         using sigrok::Channel;
 879
 880         vector< shared_ptr<TraceTreeItem> > new_top_level_items;
 881
 882         const auto device = session_.device();
 883         if (!device)
 884                 return;
 885
 886         shared_ptr<sigrok::Device> sr_dev = device->device();
 887         assert(sr_dev);
 888
 889         const vector< shared_ptr<Channel> > channels(
 890                 sr_dev->channels());
 891
 892         // Make a list of traces that are being added, and a list of traces
 893         // that are being removed
 894         const vector<shared_ptr<Trace>> prev_trace_list = list_by_type<Trace>();
 895         const set<shared_ptr<Trace>> prev_traces(
 896                 prev_trace_list.begin(), prev_trace_list.end());
 897
 898         const unordered_set< shared_ptr<Signal> > sigs(session_.signals());
 899
 900         set< shared_ptr<Trace> > traces(sigs.begin(), sigs.end());
 901
 902 #ifdef ENABLE_DECODE
 903         const vector< shared_ptr<DecodeTrace> > decode_traces(
 904                 session().get_decode_signals());
 905         traces.insert(decode_traces.begin(), decode_traces.end());
 906 #endif
 907
 908         set< shared_ptr<Trace> > add_traces;
 909         set_difference(traces.begin(), traces.end(),
 910                 prev_traces.begin(), prev_traces.end(),
 911                 inserter(add_traces, add_traces.begin()));
 912
 913         set< shared_ptr<Trace> > remove_traces;
 914         set_difference(prev_traces.begin(), prev_traces.end(),
 915                 traces.begin(), traces.end(),
 916                 inserter(remove_traces, remove_traces.begin()));
 917
 918         // Make a look-up table of sigrok Channels to pulseview Signals
 919         unordered_map<shared_ptr<sigrok::Channel>, shared_ptr<Signal> >
 920                 signal_map;
 921         for (const shared_ptr<Signal> &sig : sigs)
 922                 signal_map[sig->channel()] = sig;
 923
 924         // Populate channel groups
 925         for (auto entry : sr_dev->channel_groups())
 926         {
 927                 const shared_ptr<sigrok::ChannelGroup> &group = entry.second;
 928
 929                 if (group->channels().size() <= 1)
 930                         continue;
 931
 932                 // Find best trace group to add to
 933                 TraceTreeItemOwner *owner = find_prevalent_trace_group(
 934                         group, signal_map);
 935
 936                 // If there is no trace group, create one
 937                 shared_ptr<TraceGroup> new_trace_group;
 938                 if (!owner) {
 939                         new_trace_group.reset(new TraceGroup());
 940                         owner = new_trace_group.get();
 941                 }
 942
 943                 // Extract traces for the trace group, removing them from
 944                 // the add list
 945                 const vector< shared_ptr<Trace> > new_traces_in_group =
 946                         extract_new_traces_for_channels(group->channels(),
 947                                 signal_map, add_traces);
 948
 949                 // Add the traces to the group
 950                 const pair<int, int> prev_v_extents = owner->v_extents();
 951                 int offset = prev_v_extents.second - prev_v_extents.first;
 952                 for (shared_ptr<Trace> trace : new_traces_in_group) {
 953                         assert(trace);
 954                         owner->add_child_item(trace);
 955
 956                         const pair<int, int> extents = trace->v_extents();
 957                         if (trace->enabled())
 958                                 offset += -extents.first;
 959                         trace->force_to_v_offset(offset);
 960                         if (trace->enabled())
 961                                 offset += extents.second;
 962                 }
 963
 964                 // If this is a new group, enqueue it in the new top level
 965                 // items list
 966                 if (!new_traces_in_group.empty() && new_trace_group)
 967                         new_top_level_items.push_back(new_trace_group);
 968         }
 969
 970         // Enqueue the remaining logic channels in a group
 971         vector< shared_ptr<Channel> > logic_channels;
 972         copy_if(channels.begin(), channels.end(), back_inserter(logic_channels),
 973                 [](const shared_ptr<Channel>& c) {
 974                         return c->type() == sigrok::ChannelType::LOGIC; });
 975         const vector< shared_ptr<Trace> > non_grouped_logic_signals =
 976                 extract_new_traces_for_channels(logic_channels,
 977                         signal_map, add_traces);
 978         const shared_ptr<TraceGroup> non_grouped_trace_group(
 979                 make_shared<TraceGroup>());
 980         for (shared_ptr<Trace> trace : non_grouped_logic_signals)
 981                 non_grouped_trace_group->add_child_item(trace);
 982         new_top_level_items.push_back(non_grouped_trace_group);
 983
 984         // Enqueue the remaining channels as free ungrouped traces
 985         const vector< shared_ptr<Trace> > new_top_level_signals =
 986                 extract_new_traces_for_channels(channels,
 987                         signal_map, add_traces);
 988         new_top_level_items.insert(new_top_level_items.end(),
 989                 new_top_level_signals.begin(), new_top_level_signals.end());
 990
 991         // Enqueue any remaining traces i.e. decode traces
 992         new_top_level_items.insert(new_top_level_items.end(),
 993                 add_traces.begin(), add_traces.end());
 994
 995         // Remove any removed traces
 996         for (shared_ptr<Trace> trace : remove_traces) {
 997                 TraceTreeItemOwner *const owner = trace->owner();
 998                 assert(owner);
 999                 owner->remove_child_item(trace);
1000         }
1001
1002         // Add and position the pending top levels items
1003         for (auto item : new_top_level_items) {
1004                 add_child_item(item);
1005
1006                 // Position the item after the last present item
1007                 int offset = v_extents().second;
1008                 const pair<int, int> extents = item->v_extents();
1009                 if (item->enabled())
1010                         offset += -extents.first;
1011                 item->force_to_v_offset(offset);
1012                 if (item->enabled())
1013                         offset += extents.second;
1014         }
1015
1016         update_layout();
1017
1018         header_->update();
1019         viewport_->update();
1020 }
1021
1022 void View::capture_state_updated(int state)
1023 {
1024         if (state == Session::Running)
1025                 set_time_unit(util::TimeUnit::Samples);
1026
1027         if (state == Session::Stopped) {
1028                 // After acquisition has stopped we need to re-calculate the ticks once
1029                 // as it's otherwise done when the user pans or zooms, which is too late
1030                 calculate_tick_spacing();
1031
1032                 // Reset "always zoom to fit", the acquisition has stopped
1033                 if (always_zoom_to_fit_) {
1034                         always_zoom_to_fit_ = false;
1035                         always_zoom_to_fit_changed(false);
1036                 }
1037         }
1038 }
1039
1040 void View::data_updated()
1041 {
1042         if (always_zoom_to_fit_ || sticky_scrolling_) {
1043                 if (!delayed_view_updater_.isActive())
1044                         delayed_view_updater_.start();
1045         } else {
1046                 determine_time_unit();
1047                 update_scroll();
1048                 ruler_->update();
1049                 viewport_->update();
1050         }
1051 }
1052
1053 void View::perform_delayed_view_update()
1054 {
1055         if (always_zoom_to_fit_)
1056                 zoom_fit(true);
1057
1058         if (sticky_scrolling_) {
1059                 // Make right side of the view sticky
1060                 double length = 0;
1061                 Timestamp offset;
1062                 get_scroll_layout(length, offset);
1063
1064                 const QSize areaSize = viewport_->size();
1065                 length = max(length - areaSize.width(), 0.0);
1066
1067                 set_offset(scale_ * length);
1068         }
1069
1070         determine_time_unit();
1071         update_scroll();
1072         ruler_->update();
1073         viewport_->update();
1074 }
1075
1076 void View::process_sticky_events()
1077 {
1078         if (sticky_events_ & TraceTreeItemHExtentsChanged)
1079                 update_layout();
1080         if (sticky_events_ & TraceTreeItemVExtentsChanged) {
1081                 restack_all_trace_tree_items();
1082                 update_scroll();
1083         }
1084
1085         // Clear the sticky events
1086         sticky_events_ = 0;
1087 }
1088
1089 void View::on_hover_point_changed()
1090 {
1091         const vector<shared_ptr<TraceTreeItem>> trace_tree_items(
1092                 list_by_type<TraceTreeItem>());
1093         for (shared_ptr<TraceTreeItem> r : trace_tree_items)
1094                 r->hover_point_changed();
1095 }
1096
1097 } // namespace view
1098 } // namespace pv